Flask_testing Returns 404 unexpectedly for seemingly working endpoint

Question

Writing some unit tests for my flask application. The endpoint '/' works and returns 200 when I try in postman, however flask_testing gives AssertionError: 404 != 200

I have set up a base config.

class BaseTestCase(TestCase):

    def create_app(self):
        app = Flask(__name__)
        app.config['TESTING'] = True
        app.config['SQLALCHEMY_DATABASE_URI'] = "sqlite:///:memory:"
        app.config['JWT_SECRET_KEY'] = environ['JWT_SECRET_KEY']
        db = SQLAlchemy(app)
        db.init_app(app)
        return app

This is the test.

class FlaskTestCase(BaseTestCase):

    def test_root(self):
        response = self.client.get('/')
        self.assertEquals(response.status_code, 200)

Output from tests

======================================================================
FAIL: test_root (test.server-test.FlaskTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/my_name/path/to/my_project/test/server-test.py", line 13, in test_root
    self.assertEquals(response.status_code, 200)
AssertionError: 404 != 200

----------------------------------------------------------------------
Ran 1 test in 0.032s

FAILED (failures=1)

I'm not sure how I would add them. If I look at this example here https://github.com/realpython/discover-flask/blob/master/tests/test_basic.py the subjects under test are not explicitly imported. — SarahJessica, Nov 11 '19 at 09:48
I can only help you by looking at the app structure and code. From given information I think routes are not being added in your tests code. — Srikanth Chekuri, Nov 11 '19 at 09:51

score 1 · Answer 1 · answered Feb 09 '21 at 12:35

in my case I had this if statement in the route I was testing

if len(books_per_request) == 0:
   response = make_response(jsonify(message="value exceeded books count"), 404)

While it successful request I sent 404 error for that reason when test run and count len == 0 it keep return the error if this your first test like me check with normal route that return normal string if every thing ok , check your home route '/'

make sure it exist in your init.py file
and make sure it not return any 404 errors

I hope this help anyone

Flask_testing Returns 404 unexpectedly for seemingly working endpoint

1 Answers1